OpenGL编程与实例。介绍OpenGL图形编程的原理、步骤，有详细的实例说明。-OpenGL programming and examples. Introduced the principle of OpenGL graphics programming, step by step, detailed examples.

通信原理实验中的均匀和非均匀的pcm两种编码方式,附有详细的说明,-Communication principle of uniform and non-uniform of PCM encoding, accompanied by detailed instructions,